Apparent episodicity of magmatic activity based on radiometric age determination: A section in The United States Geological Survey in Alaska: Accomplishments during 1980
Links
- More information: Publisher Index Page
- Document: Report
- Larger Work: The United States Geological Survey in Alaska: Accomplishments during 1980
- Download citation as: RIS | Dublin Core
Abstract
Results of recent potassium-argon age studies in the Chignik region, Alaska, (Wilson, 1980; Wilson and others, 1982) have suggested a distinct episodicity in igneous activity during Tertiary time. To date work on the Aleutian magmatic arc indicates that plutonic activity took place along the present outer Pacific margin and in the northern Alaska-Aleutian Range batholith (Reed and Lanphere, 1973; Kienle and Turner, 1976; DeLong and others, 1978) in latest Cretaceous and earliest Tertiary time (70-58 m.y.) and was followed by a hiatus lasting until late Eocene ( 45 m.y~) time. Late Eocene to earliest Miocene ( 45-20 m.y.) magmatic activity was followed by a middle Miocene hiatus (10 m.y.). Since that time, magmatic activity in the Aleutian arc has been continuous.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Apparent episodicity of magmatic activity based on radiometric age determination: A section in The United States Geological Survey in Alaska: Accomplishments during 1980 |
| Series title | Circular |
| Series number | 844 |
| DOI | 10.3133/70180224 |
| Year Published | 1982 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Alexandria, VA |
| Contributing office(s) | Alaska Science Center |
| Description | 3 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | The United States Geological Survey in Alaska: Accomplishments during 1980 (Circular 844) |
| First page | 13 |
| Last page | 15 |
| Country | United States |
| State | Alaska |
| Google Analytic Metrics | Metrics page |